Casualties unknown

1992-09-10: Air Tractor AT-301 (N8823S) — Kirby J. Hahn — Alice, ND

Alice, ND, US

On September 10, 1992, an Air Tractor AT-301 (registration N8823S) operated by Kirby J. Hahn was involved in an aviation accident near Alice, ND. Investigators recorded the probable cause as: Four cylinders lost compression due to damaged piston ring lands, allowing blow-by. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 1781061362Data APIEditorial standards

An agricultural pilot on his second flight of the day experienced a complete loss of power just after takeoff. The airplane landed in small trees 50 feet from the runway end and nosed over into a corn field.

Incident Overview

An agricultural pilot was conducting his second flight of the day when, just after takeoff, he experienced a complete loss of power. The airplane subsequently landed in small trees located approximately 50 feet from the end of the runway and nosed over into an adjacent corn field.

Investigation Findings

A post-accident investigation revealed that four of the cylinders had lost compression. Further examination showed that the piston ring lands on the pistons within those four cylinders were damaged, which allowed blow-by to occur. Blow-by refers to the leakage of combustion gases past the piston rings into the crankcase, resulting in a loss of engine power.

Conclusion

The investigation did not provide any additional details regarding the aircraft type, registration, operator, or the pilot's condition. No information was available on injuries, fatalities, weather conditions, time of day, or air traffic control involvement. The findings remained limited to the mechanical failure identified in the engine.

Probable cause

Four cylinders lost compression due to damaged piston ring lands, allowing blow-by.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001211X15640. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.